Do the things in ImageResource::allClientsAndObserversRemoved() asynchronously

third_party/WebKit/Source/core/fetch/ImageResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 78 matching lines @@
     // If this ImageResource has the Lo-Fi response headers, reload it with
     // the Lo-Fi state set to off and bypassing the cache.
     void reloadIfLoFi(ResourceFetcher*);
 
     void addObserver(ImageResourceObserver*);
     void removeObserver(ImageResourceObserver*);
     bool hasClientsOrObservers() const override { return Resource::hasClientsOrObservers() || !m_observers.isEmpty() || !m_finishedObservers.isEmpty(); }
 
     ResourcePriority priorityFromObservers() override;
 
-    void allClientsAndObserversRemoved() override;
+    void cancelTimerFired(Timer<Resource>*) override;
 
     void appendData(const char*, size_t) override;
     void error(const ResourceError&) override;
     void responseReceived(const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
     void finish(double finishTime = 0.0) override;
 
     // For compatibility, images keep loading even if there are HTTP errors.
     bool shouldIgnoreHTTPStatusCodeErrors() const override { return true; }
 
     bool isImage() const override { return true; }
@@ skipping 58 matching lines @@
     bool m_hasDevicePixelRatioHeaderValue;
     HashCountedSet<ImageResourceObserver*> m_observers;
     HashCountedSet<ImageResourceObserver*> m_finishedObservers;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Image);
 
 } // namespace blink
 
 #endif